TODAY
Hydrother-puppy
Who let the dogs in? The Silverthorne Recreation Center pool is open to dogs today before the aquatic area is closed for spring cleaning. There are two sessions that accommodate 75 dogs each, but the dogs must have proof of vaccines for rabies, distemper and bordatella. Life jackets are optional — but some people put them on their dogs. Cost: $12 (one dog), $15 (two dogs) or $17 (three dogs). 9 a.m. and 11 a.m., Silverthorne Recreation Center 430 Rainbow Drive, Silverthorne; 970-668-7370,
MORE FOR THE WEEK
TODAY
Tulip Fairy & Elf Parade proves that Boulder is still weird. Girls and boys dress as fairies and elves at this family tradition that ends at the St. Julien Hotel, with tulips, treats and tunes. Free. 2 p.m. parade starts at 1100 Pearl St., Boulder; details at boulderdown
WEDNESDAY
Turn it up to 11 at Spinal Tap’s “Unwigged and Unplugged” reunion concert, the trio’s first official visit to Denver since 1993. Hear Tap favorites (“Sex Farm Woman,” “Big Bottom”) and some tunes from “A Mighty Wind.” Tickets: $39.50 to $55. Bring your own cricket bat. 8 p.m., Paramount Theatre, 1621 Glenarm Place, Denver; 866-461-6556,
SATURDAY
State History Day competition showcases Colorado’s brightest middle school and high school historians interpreting this year’s theme, “The Individual in History.” The divisions include papers, board displays, performances, websites and documentaries. The papers, exhibits and websites will be open to the public from 2 to 4 p.m.; performances and documentaries are all open. 8 a.m. to 6 p.m., Auraria campus, University of Colorado at Denver, 900 Auraria Parkway; coloradohistory
SATURDAY
Cleanup at Castlewood is a chance to declare war on noxious weeds, learn new skills and meet other volunteers. Free; admission waived. Call for cleanup locations in the park. 9 a.m. to 11 a.m., Castlewood Canyon State Park, 2989 South State Highway 83, Franktown; 303-688-5242, /parks/castlewoodcanyon
